Su Esaslı Seyreltik Fe+ZnO Hibrit Nanoakışkanının Düşük Isı Akısı Şartında Havuz Kaynama Isı Transferi Özellikleri: Sayısal Bir Çalışma

Abstract

Thermophysical properties of the working fluid of a fluid-driven heat transfer system is the key parameter in determination of heat transfer performance of the system they were used. The nanofluids, nanoparticles containing colloidal suspensions, have been extensively used for performance enhancement in many applications, however, the nanoparticles cannot have both high thermal conductivity and good stability simultaneously. To provide these characteristics together, hybrid utilization of nanoparticles has emerged. In this numerical study, pool boiling heat transfer characteristics of dilute Fe+ZnO/deionized water hybrid nanofluid were investigated under low heat flux condition. The hybrid nanofluid suspension at the volumetric rate of 0.5% and Fe+ZnO combination of (50:50) were taken into account. For numerical simulations, Computational Fluid Dynamics approach and Volume-of-Fluid multiphase model were employed. Vapor volume fractions and velocity vectors in fluid medium were obtained for deionized water, and the hybrid nanofluid aforementioned. The start-up of the bubbles and departures with time were investigated for each working fluid. Under the same conditions, the start-up time of the boiling for deionized water and dilute hybrid nanofluid were observed as 468. and 441. seconds, respectively. The numerical findings also displayed that hybrid nanofluids can be used for pool boiling implementations in order to provide improved heat transfer characteristics.